fix: Fix spotbugsMain

Author: Stefan Steinhauser

src/main/java/net/sf/jsqlparser/statement/CertificateVerification.java

@@ -11,7 +11,9 @@
 
 import net.sf.jsqlparser.expression.StringValue;
 
-public class CertificateVerification {
+import java.io.Serializable;
+
+public class CertificateVerification implements Serializable {
     private Boolean ignoreCertificate;
     private StringValue publicKey;
 

src/main/java/net/sf/jsqlparser/statement/ConnectionDefinition.java

@@ -11,7 +11,9 @@
 
 import net.sf.jsqlparser.expression.StringValue;
 
-public class ConnectionDefinition {
+import java.io.Serializable;
+
+public class ConnectionDefinition implements Serializable {
     private String connectionObjectName;
     private StringValue connectionDefinition;
     private UserIdentification userIdentification;

src/main/java/net/sf/jsqlparser/statement/ErrorClause.java

@@ -11,7 +11,9 @@
 
 import net.sf.jsqlparser.expression.Expression;
 
-public class ErrorClause {
+import java.io.Serializable;
+
+public class ErrorClause implements Serializable {
     private ErrorDestination errorDestination;
     private Expression expression;
     private RejectClause rejectClause;

src/main/java/net/sf/jsqlparser/statement/RejectClause.java

@@ -11,7 +11,9 @@
 
 import net.sf.jsqlparser.expression.LongValue;
 
-public class RejectClause {
+import java.io.Serializable;
+
+public class RejectClause implements Serializable {
     private LongValue limit;
     private boolean errors;
 

src/main/java/net/sf/jsqlparser/statement/UserIdentification.java

@@ -11,7 +11,9 @@
 
 import net.sf.jsqlparser.expression.StringValue;
 
-public class UserIdentification {
+import java.io.Serializable;
+
+public class UserIdentification implements Serializable {
     private StringValue user;
     private StringValue password;
 

src/main/java/net/sf/jsqlparser/statement/export/DBMSTableDestinationOption.java

@@ -13,7 +13,9 @@
 import net.sf.jsqlparser.expression.LongValue;
 import net.sf.jsqlparser.expression.StringValue;
 
-public class DBMSTableDestinationOption {
+import java.io.Serializable;
+
+public class DBMSTableDestinationOption implements Serializable {
     private String key;
     private Expression value;